LOS ANGELES — Before starting work on the next “Transformers” film, Josh Duhamel is lending his star power to help disabled veterans. Duhamel is supporting a campaign that provides smart homes for injured American veterans, and he’s encouraging others to do the same. The 43-year-old actor appears in a video that shows how the #EnlistMe effort restores independence to injured veterans by building wheelchair-accessible homes with high-tech digital features. “My aunt was deployed to the Balkans, into Iraq, my grandfather was a World War II vet,” Duhamel said. “Having met a lot of these veterans, Navy SEALs, all kinds of special-ops guys over the last several years working, I really took an interest and really started learning more about what these guys really go through, especially when they come back.” Besides helping injured servicemen and women, Duhamel said it’s important...